It's abouf how a grey haired guy forgot how he lose his leg, and was taken care by a dark haired guy. He always thought that the dark haired guy are the reason he loses his leg, but later.. (Wait it'll be a spoiler, I just don't remember the title)
https://www.mangago.me/read-manga/a_room_without_space_side_story_1/
Oh yeahh this is it, THANK YOU VERY MUCH!!! Here's a virtual kiss (づ¯3¯)づ
It's abouf how a grey haired guy forgot how he lose his leg, and was taken care by a dark haired guy. He always thought that the dark haired guy are the reason he loses his leg, but later.. (Wait it'll be a spoiler, I just don't remember the title)